VONA stands for Volcano Observatory Notice for Aviation. It issues reports for changes, both increases and decreases, in volcanic activities, providing a description on the nature of the unrest or eruption, potential or current hazards as well as likely outcomes. See the following link (USGS) for further details. The Center for Volcanology and Geological Hazard Mitigation (CVGHM) under the Geological Agency of the Indonesian Ministry of Energy and Mineral Resources produced VONA's reports based on analysis of data from the agency's monitoring networks as well as from direct observations. VONA's alert levels are color-coded to indicate the different types of notifications addressing specific informative needs. The reports are disseminated via email to national and international stakeholders in the aviation sector. Other interested parties can avail of them through email subscription. All notifications are publicly available online.
USGS14th of January 2023, 2 weeks ago
Eruption with volcanic ash cloud at 0117 UTC (0817 local). Best estimate of ash-cloud top is around 10211 FT (3191 M) above sea level or 960 FT (300 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
View12th of January 2023, 2 weeks ago
Eruption with volcanic ash cloud at 1124 UTC (1824 local). Best estimate of ash-cloud top is around 10211 FT (3191 M) above sea level or 960 FT (300 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to northeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
ViewEruption with volcanic ash cloud at 0517 UTC (1217 local). Best estimate of ash-cloud top is around 11491 FT (3591 M) above sea level or 2240 FT (700 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from northeast to southeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
ViewEruption with volcanic ash cloud at 0358 UTC (1058 local). Best estimate of ash-cloud top is around 12451 FT (3891 M) above sea level or 3200 FT (1000 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from northeast to southeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
ViewEruption with volcanic ash cloud at 0342 UTC (1042 local). Best estimate of ash-cloud top is around 10211 FT (3191 M) above sea level or 960 FT (300 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from northeast to southeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
ViewEruption with volcanic ash cloud at 0236 UTC (0936 local). Best estimate of ash-cloud top is around 10371 FT (3241 M) above sea level or 1120 FT (350 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from northeast to southeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
View11th of January 2023, 2 weeks ago
Eruption with volcanic ash cloud at 2340 UTC (0640 local). Best estimate of ash-cloud top is around 10371 FT (3241 M) above sea level or 1120 FT (350 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from northeast to east. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed from medium to thick..
ViewEruption with volcanic ash cloud at 0433 UTC (1133 local). Best estimate of ash-cloud top is around 10531 FT (3291 M) above sea level or 1280 FT (400 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from east to southeast. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
ViewEruption with volcanic ash cloud at 0241 UTC (0941 local). Best estimate of ash-cloud top is around 10851 FT (3391 M) above sea level or 1600 FT (500 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from north to northeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
ViewEruption with volcanic ash cloud at 0125 UTC (0825 local). Best estimate of ash-cloud top is around 11811 FT (3691 M) above sea level or 2560 FT (800 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from northeast to southeast. Volcanic ash is observed to be gray. The intensity of volcanic ash is observed to be thick..
View10th of January 2023, 2 weeks ago
Eruption with volcanic ash cloud at 0212 UTC (0912 local). Best estimate of ash-cloud top is around 10211 FT (3191 M) above sea level or 960 FT (300 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from northeast to southeast. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
ViewEruption with volcanic ash cloud at 0200 UTC (0900 local). Best estimate of ash-cloud top is around 9891 FT (3091 M) above sea level or 640 FT (200 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from northeast to southeast. Volcanic ash is observed to be white. The intensity of volcanic ash is observed to be thick..
View8th of January 2023, 3 weeks ago
Eruption with volcanic ash cloud at 2334 UTC (0634 local). Best estimate of ash-cloud top is around 10051 FT (3141 M) above sea level or 800 FT (250 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving from east to southeast. Volcanic ash is observed to be white. The intensity of volcanic ash is observed to be thick..
ViewEruption with volcanic ash cloud at 0600 UTC (1300 local). Best estimate of ash-cloud top is around 9891 FT (3091 M) above sea level or 640 FT (200 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to east. Volcanic ash is observed to be white to gray. The intensity of volcanic ash is observed to be thick..
ViewEruption with volcanic ash cloud at 0550 UTC (1250 local). Best estimate of ash-cloud top is around 9731 FT (3041 M) above sea level or 480 FT (150 M) above summit. May be higher than what can be observed clearly. Source of height data: ground observer. Ash cloud moving to southeast. Volcanic ash is observed to be white. The intensity of volcanic ash is observed to be thick..
ViewVolcano is in normal, non-eruptive state, or, after a change from a higher level: Volcanic activity considered to have ceased, and volcano reverted to its normal, non-eruptive state.
Volcano is experiencing signs of elevated unrest above known background levels, or, after a change from higher level: Volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase.
Volcano is exhibiting heightened unrest with increased likelihood of eruption with column height below 6000 meter above sea level.
Eruption is forecast to be imminent with significant emission of ash with column height above 6000 meter above sea level.
